Device for sharpening the blades of safety razors



Jan. 9, 1934. w. BARSCH 1,943,156

DEVICE FOR SHARPENING THE BLADES OF SAFETY RAZORS Filed Oct. 29, 1930 lnvenfon Will/am Barscf;

Patented Jan. 9, 1934 UNITED STATES DEVICE FOR SHARPENING THE BLADES OF SAFETY RAZORS William Bar-sch, Paris,

firm Industrie A. G.

Lucerne, Switzerland France, assignor. to the Allegro Ernmenbrucke,

Application October 29, 1930, Serial No. 492,065, and in Germany February 6, 1930 6 Claims.

The invention relates to a device for sharpening the blades of safety razors having a sharpening body arranged obliquely in the path of the blade and having sharpening surfaces of differentv nature, as for instance a honing and a stropping surface, which may be alternately brought into working position. The blade is mounted in a carriage and drawn back and forth across the sharpening surfaces. The latter are made convex so that the sharpening takes place along a generatrix of the convex surface only. A better sharpening effect is hereby obtained. Means may be provided whereby any desired generatrix Within a given range of the sharpening surface can be placed into the highest or working position. Such means may be a cam lever, such as described and claimed in applicants U. S. application S. No. 375,302. An object of the present invention is to provide means whereby the oscillation of the sharpening body is obtained automatically in such a way that the friction of the blade edge upon the sharpening surface causes the sharpening body to swing about its longitudinal axis.

The invention is illustrated in the accompanying drawing in which Fig. 1 is a longitudinal section through a sharpening device for safety razors, taken along line 11 of Fig. 2,

Fig. 2 is a plan view of the device,

Fig. 3 is a plan view of one end of the sharpening body,

Fig. 4 is a section on line 4-4 of Fig. 3, and

Fig. 5 is a similar section through parts of a slightly modified form.

The device comprises, as usual, a frame 1 in which a carriage 2 supporting the blade holder 3 with the blade 4 is slidably mounted. A sharpening body 5 is mounted in frame 1 obliquely to the path of the blade and below the latter. The sharpening body may be turned about its longitudinal axis.

The axis of the blade holder 3 is provided with guide levers 6 and friction disks '7 which guide the blade in cooperation with races 8 of the frame 1 by pressing the edge of the blade upon the sharpening surface during the movement of the carriage. Should the movement of the carriage be reversed before the end of the stroke, the blade edge is automatically lifted from the sharpening surface so that it cannot cut into the latter.

The sharpening body 5 has a honing surface 9 and a stropping surface 10, and is mounted pivotally about its axis at 11 and 11 in supports 12, 13 of the frame 1, to permit either surface to be turned up into working position. The pivot 11 has a flat portion 14 which engages the convex surface 15 of a slide 16 mounted upon support 12 and resting upon a spring 17 the ends of which bear against the bottom plate 18 of frame 1.

The sharpening body is thus held in its correct working position by spring 17.

It may easily be seen that a lateral pressure upon the sharpening body as it is exerted by the friction of the blade edge on the sharpening sur face will cause the sharpening body to yield and to be turned slightly out of its central position against the pressure of spring 17. The frictional force increases with the speed of the carriage movement. The sharpening thus occurs along a great number of generating lines of the sharpening surface, as for instance between the points C and D (Fig. 4). When the sharpening body yields to the pressure, of the blade, as described above, the bottom surface of the flat portion 14 and the convex surface 15 roll upon each other. The two sides of part 14 may also be convex if desired. The slide 16 may be made with an inverted V shaped contact surface, as shown in Fig. 5. This latter shape permits the sharpening body to yield to a very light frictional force.

Should the movement of the carriage be reversed while the blade edge is still on the sharpening surface, the blade is turned and the edge lifted off the sharpening surface by the action of the friction disks '1, as mentioned above. The special mounting of the sharpening body permitting it to yield to a light lateral pressure, offers additional security against damage to either blade or sharpening surface.

When the blade has been drawn sufficiently across the honing surface of the sharpening body, the latter is turned completely by means of a handle 20 in the direction of the arrow in Fig. 4. The flat portion 14 presses the slide 16 down against the action of spring 17. After a quarter turn the movement continues automatically by the spring pressure until the half turn is prising a frame, a blade carrierslidably mounted in the frame, a sharpening body having two convex operative sides opposite to each other, said sharpening body being arranged obliquely to the path of the cutting edge of the blade, an element having a convex surface, a fiat portion on the sharpening body engaging said convex surface, and a spring between said element and the frame for yieldingly urging the convex surface of said element against said fiat portion.

3. A sharpening device for razor blades comprising a frame, a blade carrier slidably mounted in the frame, a sharpening body having two convex operative sides opposite to each other, said sharpening body being mounted in bearings and arranged obliquely to the path of thecutting edge of the blade, an element having a convex surface, a flat portion on the axis of the sharpening body and in engagement with said convex surface, and a spring between the element and the frame for yieldingly urging the convex surface against the flat portion and for urging the pivots of the sharpening body against one wall of their bearings.

4. A sharpening device for razor blades comprising a frame, a blade carrier slidably mounted in said frame, a sharpening body, said sharpen across the body.

5. A sharpening device for razor blades comprising a frame, a blade carrier slidably mounted in said frame, a sharpening body, said sharpening body being provided with a convex operative side and arranged obliquely to the cutting edges of a blade in the blade carrier, means for supporting said body oscillatably on said frame, and resilient means resisting at all times but not preventing oscillation of said body, whereby successive generatrices of the sharpening body are automatically brought into engagement with the cutting edge of the blade during movement thereof across the body.

6. A sharpening device for razor blades comprising a frame, a'blade carrier slidably mountedin said frame, a sharpening body, said sharpening body being provided with two convex operative-sides opposite to each other and arranged obliquely to the cutting edges of a blade in the blade carrier, means for supporting said body oscillatably on said frame, and resilient means resisting at all times but not preventing oscillation of said body, whereby successive generatricesof the sharpening body are automatically brought into engagement with the cutting edge of the blade during movement thereof across the body.

WILLIAM BARSCl-I.

CERTEFEGATE Q5 CQRRECTEQN.

Paieht Na. 3343, 156. January 9, 1934.

WILLEAM hARSCH.

it is hereby certified ihait ihe name hi the assignee in the above gateht was ermnemzsiy Writteh and printed as "Emhisirie A. G. Aiiegm, Ernmenhniche" whereas saiii i should have been written and rimeii as ihdusirie A. G. Aliagm, Eminehhi'ushe, as shown by the records 03% assignments in this hfiice; and that the said Letters Patent shmiid he read with this carraction therein that the same may conform to the recard of the case in the Paiem Ofiice.

Signed and sealed this 13th day 0? March, A. D. 193 1,

F. M. Hopkins (Sea!) Acting Commissioner of Patents. 

